Electrical conductor.



F. H. PRITGHARD.

ELECTRICAL CONDUCTOR.

APPLICATION FILED JULY 2, 1914.

1,146,348. I Patented July 13,1915.

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COLUMBIA PLANOURAPH 50.,WASKINOTOM. n c.

UNITED STATES PATENT OFFICE.

FRANKLIN H. rnrroimnn, 0F sonnnnc'rnny, NEW YORK, AssIeNoRro GENERAL 1 nnncrnrc COMPANY, A conronn'rroiv on NEW YORK.

ELECTRIC L communion,

To all whom it may concern."

. Be it known that I, FRANKLIN H. PRITCI-I- Ann, a citizen of the United States, residat Schenectady, in the county of, Schenectady, State of New York, have lnvented certain new and useful Improvements in Electrical Conductors, of which the: following is a specification. I

My invention relates to electrical conductors and is particularly applicable to such conductors when used in armatures of dynamo electric machines.

In dynamo electric machines, the eddy current loss in the armature conductors is largely due to the fact that as the conductor passes into and out-of the magnet field,

thevariation of flux through one portion of the conductor is greater than the var1a tion through another portion. Therefore, a solid conductor arranged on edgein a slot has a local current induced therein which flows along the top of the conductor and returns through the bottom of the conductor. In dynamo electric machines as heretofore constructed, these local currents have been considerably reduced by dividing the bar in two sections, which sections are crossed at intervals in the slot. With such conductors, however, local currents -may flow in each section if the flux density in the armature of the dynamo electric machine is very high. In accordance with my invention,

the local or eddy currents in suchcon ductors, as well as in any others, is reduced to a minimum. To this end, my invention consists in a novel construction of conductor which is dividedinto a large number of sections.

For a better understanding of my invention, reference may be had to the following description taken in connection with the accompanying drawing, in which Figure 1 represents a blankbefore it is folded into a conductor; Fig. 2 represents a completed conductor in accordance with my invention; Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2; Fig. 4 represents a blank before it is folded into a modified form of my conductor; Fig. 5 represents the completed conductor formed from the blank of Fig. 4, and Fig. 6 is a sectional View taken on the line 6-6 ofFig. 5.

In the form of construction shown in Figs. 1, 2 and 3 my conductor comprises two portions, 1-2348765 and I Specification of Letters Patent.

Application filedJuly-2, 1914. Serial No. 848,560.

Patented J u'ly 13, 1915.

567 '8-9101112. Each portion is divided into a plurality of sections. These portions in the blank, as shown in Fig. 1, consist of two parts offset from one another. Preferably the portions of the conductor are divided into sections only between the ends by means of slots extending from the points 13 to the points 14. In order to form the completed conductor, the part of the blank above thelongitudinal line 5-.63 is folded on this line, which is parallel to the bottom edge of the cond11C130I,"2tI1Cl the part of the blank below the longitudinal line 1l78 is folded on this line, both parts being folded into the same plane. part of the top edge of the completed conductor and the line 11-7'8 forms part ofthe bottom edge of the completed conductor- Fro1n Figs.,,2 andB'it will be seen that the completed conductor is substantially rectangular in cross-section, thateach portion of the conductor after folding is as deep as the resultant conductor, and that one end of each portion is in a different butparallel' plane from the other end of the same portion, the opposite ends of the, twoportions being in the same plane. As clearly seen from Fig. 2 of the drawing, if the number of sections into which each por tion of the conductor is divided is even, each section occupies a different position with reference to the depth of the conductor at the opposite ends thereof. If the number of sections is odd, each section but The line 5 63 then forms 6, the two portions composing the conductor are made separate and distinct That is, the blank of Fig. 4 is the same as if the blank of Fig. 1 was cut on the line 5678. The portion 1-2348765 is folded on the longitudinal line 6-3, and the portion 56-7-89101112 is folded on the longitudinal line l17'.

The part 1235 of the upper portion is folded on to the part 56712 of the lower portion and the part 118910 of the lower portion is folded on to the part 64.87 of the upper portion, the two folded parts 1235 and 1l8-910 being folded into the same plane. The portions of the conductor are as deep as the resultant conductor, and the sections cross over in the same way as described in connection with Figs. 2 and 3. The resultant conductor is shown in Fig. 5 and is also substantially rectangular in cross-section as seen from Fig. 6.

If desired, the portions and sections of the conductor may be insulated from each other. Furthermore the conductor may be made in any well known manner other than by folding up sheet metal strips, and I aim in the appended claims to cover such modifications as well as any others that do not depart from the spirit and scope of my invention.

that I claim as new and desire to secure by Letters Patent of the United States, is

1. An electrical conductor comprising two portions, each portion being as deep as the resultant conductor and being divided into a plurality of sections, the ends of each portion being in different planes and opposite ends of the two portions being in the same plane, said conductor being substantially rectangular in cross-section.

2, An electrical conductor comprising two portions, each portion being as deep as the resultant conductor and being divided be tween its ends into a plurality of sections, the ends of each portion being in different planes and opposite ends of the two portions being in the same plane, said conductor being substantially rectangular in crosssection.

3. An electrical conductor comprising two portions, each of said portions being divided into a plurality 0t sections and folded so that the ends of each portion are in different planes and opposite: ends of the two portions are in the same plane, each portion of said conductor after folding being as deep as the resultant conductor, said conductor being substantially rectangular in cross-section.

4:. An, electrical conductor comprising two portions, each of said portions being divided between its ends into a plurality of sections and folded so that the ends of each portion are in difierent planes and opposite ends of the two portions are in the same plane, each portion of said conductor after folding being as deep as the resultant conductor, said conductor being substantially rectangular in cross-section.

5. An electrical conductor comprising two portions, each of said portions being divided into a plurality of sections and being folded on a longitudinal line so that the ends of each portion are in different planes and opposite ends of the two portions are in the sameplane, each portion after folding being as deep as the resultant conductor, said con ductor being substantially rectangular in cross-section.

6. An electrical conductor comprising two portions, each of said .portionsbeing divided between its ends into a plurality of sections and. being folded. on a longitudinal line so that the ends of each portion are in different planes and; opposite ends of the two portions are in the same plane, each, portion after folding being as deep as the resultant conductor, said conductor being substantially rectangular in CI'OSSrSQCtlOIl.

In witness whereof, l} have hereunto set my hand this: first day of July, 1914.

c FRANKLIN H. PRITGHARD.

Witnesses BENJIAJIIN: B. HULL,

Onronn.

Copies of this, patent may be obtained for fiye cents each, addressing the Commissioner of Patents, Washington ,1 0. 

